Kirby White — a top leasing officer with Crescent Real Estate Holdings — is the new managing director of Rosemont Realty’s office, which will be in Las Colinas. White previously handled major downtown office projects including Fountain Place.

Helen Rivero, also formerly with Crescent, will be regional principal of Rosemont’s office.

“Rosemont Realty is looking to acquire real estate across the United States, and has a particular focus on Texas,” Jeffrey V. Langdon, president of Rosemont Realty, said in a statement.

White and Rivero will be among the initial staff of 11 people Rosemont will have in its new operation.

Rosemont Realty owns six office buildings in the Dallas area, with 1.4 million square feet — including the 8080 North Central tower and the Summit at Las Colinas on Carpenter Freeway in Irving.

Founded in 1991, Rosemont Realty owns about 200 office buildings in 28 states that are valued at more than $1.5 billion.